import json
import re

from django import http
from django.contrib.auth import login, authenticate, logout
from django.contrib.auth.mixins import LoginRequiredMixin
from django.core.mail import send_mail
from django.shortcuts import render, redirect

from django.db import DatabaseError
# Create your views here.
from django.urls import reverse
from django.views import View
from django_redis import get_redis_connection

from carts.utils import merge_carts_cookies_redis
from celery_tasks.email.tasks import send_verify_email
from goods.models import SKU
from meiduo_mall.utils.response_code import RETCODE
from meiduo_mall.utils.views import LoginRequiredJSONMixin
from users import constants
from users.utils import generate_verify_email_url, check_verify_email_token
from  .models import User, Address
from django.conf import settings


logger = settings.LOGGER


class UserBrowseHistory(LoginRequiredJSONMixin, View):
    """用户浏览记录"""

    def post(self, reqeust):
        """保存用户商品浏览记录"""
        # 接收参数
        json_str = reqeust.body.decode()
        json_dict = json.loads(json_str)
        sku_id = json_dict.get('sku_id')

        # 校验参数
        try:
            SKU.objects.get(id=sku_id)
        except SKU.DoesNotExist:
            return http.HttpResponseForbidden('参数sku_id错误')

        # 保存sku_id到redis
        redis_conn = get_redis_connection('history')
        user = reqeust.user
        pl = redis_conn.pipeline()
        # 先去重
        pl.lrem('history_%s' % user.id, 0, sku_id)
        # 再保存：最近浏览的商品在最前面
        pl.lpush('history_%s' % user.id, sku_id)
        # 最后截取
        pl.ltrim('history_%s' % user.id, 0, 4)
        # 执行
        pl.execute()

        # 响应结果
        return http.JsonResponse({'code': RETCODE.OK, 'errmsg': 'OK'})

    def get(self, request):
        """查询用户商品浏览记录"""
        # 获取登录用户信息
        user = request.user
        # 创建连接到redis对象
        redis_conn = get_redis_connection('history')
        # 取出列表数据（核心代码）
        sku_ids = redis_conn.lrange('history_%s' % user.id, 0, -1) # (0, 4)

        # 将模型转字典
        skus = []
        for sku_id in sku_ids:
            sku = SKU.objects.get(id=sku_id)
            skus.append({
                'id': sku.id,
                'name': sku.name,
                'price': sku.price,
                'default_image_url': sku.default_image.url
            })

        return http.JsonResponse({'code': RETCODE.OK, 'errmsg': 'OK', 'skus': skus})



class UpdateTitleAddressView(LoginRequiredJSONMixin, View):
    """更新地址标题"""

    def put(self, reqeust, address_id):
        """实现更新地址标题逻辑"""
        # 接收参数：title
        json_dict = json.loads(reqeust.body.decode())
        title = json_dict.get('title')

        # 校验参数
        if not title:
            return http.HttpResponseForbidden('缺少title')

        try:
            # 查询当前要更新标题的地址
            address = Address.objects.get(id=address_id)
            # 将新的地址标题覆盖地址标题\
            address.title = title
            address.save()
        except Exception as e:
            logger.error(e)
            return http.JsonResponse({'code': RETCODE.DBERR, 'errmsg': '更新标题失败'})

        # 响应结果
        return http.JsonResponse({'code': RETCODE.OK, 'errmsg': '更新标题成功'})


class DefaultAddressView(LoginRequiredJSONMixin, View):
    """设置默认地址"""

    def put(self, reqeust, address_id):
        """实现设置默认地址逻辑"""
        try:
            # 查询出当前哪个地址会作为登录用户的默认地址
            address = Address.objects.get(id=address_id)

            # 将指定的地址设置为当前登录用户的默认地址
            reqeust.user.default_address = address
            reqeust.user.save()
        except Exception as e:
            logger.error(e)
            return http.JsonResponse({'code': RETCODE.DBERR, 'errmsg': '设置默认地址失败'})
        # 响应结果
        return http.JsonResponse({'code': RETCODE.OK, 'errmsg': '设置默认地址成功'})



class UpdateDestoryAddressView(LoginRequiredJSONMixin, View):
    """更新和删除地址"""

    def put(self, request, address_id):
        """更新地址"""
        # 接收参数
        json_dict = json.loads(request.body.decode())
        receiver = json_dict.get('receiver')
        province_id = json_dict.get('province_id')
        city_id = json_dict.get('city_id')
        district_id = json_dict.get('district_id')
        place = json_dict.get('place')
        mobile = json_dict.get('mobile')
        tel = json_dict.get('tel')
        email = json_dict.get('email')

        # 校验参数
        if not all([receiver, province_id, city_id, district_id, place, mobile]):
            return http.HttpResponseForbidden('缺少必传参数')
        if not re.match(r'^1[3-9]\d{9}$', mobile):
            return http.HttpResponseForbidden('参数mobile有误')
        if tel:
            if not re.match(r'^(0[0-9]{2,3}-)?([2-9][0-9]{6,7})+(-[0-9]{1,4})?$', tel):
                return http.HttpResponseForbidden('参数tel有误')
        if email:
            if not re.match(r'^[a-z0-9][\w\.\-]*@[a-z0-9\-]+(\.[a-z]{2,5}){1,2}$', email):
                return http.HttpResponseForbidden('参数email有误')

        # 使用最新的地址信息覆盖指定的旧的地址信息
        try:
            Address.objects.filter(id=address_id).update(
                user=request.user,
                title=receiver,
                receiver=receiver,
                province_id=province_id,
                city_id=city_id,
                district_id=district_id,
                place=place,
                mobile=mobile,
                tel=tel,
                email=email
            )
        except Exception as e:
            logger.error(e)
            return http.JsonResponse({'code': RETCODE.DBERR, 'errmsg': '修改地址失败'})

        # 响应新的地址信息给前端渲染
        address = Address.objects.get(id=address_id)
        address_dict = {
            "id": address.id,
            "title": address.title,
            "receiver": address.receiver,
            "province": address.province.name,
            "city": address.city.name,
            "district": address.district.name,
            "place": address.place,
            "mobile": address.mobile,
            "tel": address.tel,
            "email": address.email
        }
        return http.JsonResponse({'code': RETCODE.OK, 'errmsg': '修改地址成功', 'address': address_dict})

    def delete(self, request, address_id):
        """删除地址"""
        # 实现指定地址的逻辑删除：is_delete=True
        try:
            address = Address.objects.get(id=address_id)
            address.is_deleted = True
            address.save()
        except Exception as e:
            logger.error(e)
            return http.JsonResponse({'code': RETCODE.DBERR, 'errmsg': '删除地址失败'})

        # 响应结果：code, errmsg
        return http.JsonResponse({'code': RETCODE.OK, 'errmsg': '删除地址成功'})


class AddressCreateView(LoginRequiredJSONMixin, View):
    """新增地址"""

    def post(self, reqeust):
        """实现新增地址逻辑"""
        # 判断用户地址数量是否超过上限：查询当前登录用户的地址数量
        # count = Address.objects.filter(user=reqeust.user).count()
        count = reqeust.user.addresses.count()  # 一查多，使用related_name查询
        if count > constants.USER_ADDRESS_COUNTS_LIMIT:
            return http.JsonResponse({'code': RETCODE.THROTTLINGERR, 'errmsg': '超出用户地址上限'})

        # 接收参数
        json_str = reqeust.body.decode()
        json_dict = json.loads(json_str)
        receiver = json_dict.get('receiver')
        province_id = json_dict.get('province_id')
        city_id = json_dict.get('city_id')
        district_id = json_dict.get('district_id')
        place = json_dict.get('place')
        mobile = json_dict.get('mobile')
        tel = json_dict.get('tel')
        email = json_dict.get('email')

        # 校验参数
        if not all([receiver, province_id, city_id, district_id, place, mobile]):
            return http.HttpResponseForbidden('缺少必传参数')
        if not re.match(r'^1[3-9]\d{9}$', mobile):
            return http.HttpResponseForbidden('参数mobile有误')
        if tel:
            if not re.match(r'^(0[0-9]{2,3}-)?([2-9][0-9]{6,7})+(-[0-9]{1,4})?$', tel):
                return http.HttpResponseForbidden('参数tel有误')
        if email:
            if not re.match(r'^[a-z0-9][\w\.\-]*@[a-z0-9\-]+(\.[a-z]{2,5}){1,2}$', email):
                return http.HttpResponseForbidden('参数email有误')

        # 保存用户传入的地址信息
        try:
            address = Address.objects.create(
                user=reqeust.user,
                title = receiver, # 标题默认就是收货人
                receiver = receiver,
                province_id = province_id,
                city_id = city_id,
                district_id = district_id,
                place = place,
                mobile = mobile,
                tel = tel,
                email = email,
            )

            # 如果登录用户没有默认的地址，我们需要指定默认地址
            if not reqeust.user.default_address:
                reqeust.user.default_address = address
                reqeust.user.save()

        except Exception as e:
            logger.error(e)
            return http.JsonResponse({'code': RETCODE.DBERR, 'errmsg': '新增地址失败'})

            # 构造新增地址字典数据
        address_dict = {
            "id": address.id,
            "title": address.title,
            "receiver": address.receiver,
            "province": address.province.name,
            "city": address.city.name,
            "district": address.district.name,
            "place": address.place,
            "mobile": address.mobile,
            "tel": address.tel,
            "email": address.email
        }
        # 响应新增地址结果：需要将新增的地址返回给前端渲染
        return http.JsonResponse({'code': RETCODE.OK, 'errmsg': '新增地址成功','address': address_dict})




class AddressView(LoginRequiredMixin, View):
    """用户收货地址"""

    def get(self, request):
        """查询并展示用户地址信息"""

        # 获取当前登录用户对象
        login_user = request.user
        # 使用当前登录用户和is_deleted=False作为条件查询地址数据
        addresses = Address.objects.filter(user=login_user, is_deleted=False)

        # 将用户地址模型列表转字典列表:因为JsonResponse和Vue.js不认识模型类型，只有Django和Jinja2模板引擎认识
        address_list = []
        for address in addresses:
            address_dict = {
                "id": address.id,
                "title": address.title,
                "receiver": address.receiver,
                "province": address.province.name,
                "city": address.city.name,
                "district": address.district.name,
                "place": address.place,
                "mobile": address.mobile,
                "tel": address.tel,
                "email": address.email
            }
            address_list.append(address_dict)

        # 构造上下文
        context = {
            'default_address_id': login_user.default_address_id,
            'addresses': address_list
        }

        return render(request, 'user_center_site.html', context)


class VerifyEmailView(View):
    """验证邮箱"""

    def get(self, request):
        # 接收参数
        token = request.GET.get('token')

        # 校验参数
        if not token:
            return http.HttpResponseForbidden('缺少token')

        # 从token中提取用户信息user_id ==> user
        user = check_verify_email_token(token)
        if not user:
            return http.HttpResponseBadRequest('无效的token')

        # 将用户的email_active字段设置为True
        try:
            user.email_active = True
            user.save()
        except Exception as e:
            logger.error(e)
            return http.HttpResponseServerError('激活邮箱失败')

        # 响应结果：重定向到用户中心
        return redirect(reverse('users:info'))




class EmailView(LoginRequiredJSONMixin,View):
    '''添加邮箱'''
    def put(self,request):

        # 接收参数
        json_str = request.body.decode()  # body 类型是bytes  json_str   {},[] ---json__>loads ---> dict  list  python-----dumps------json_str
        json_dict = json.loads(json_str)
        email = json_dict.get('email')

        # 校验参数
        if not re.match(r'^[a-z0-9][\w\.\-]*@[a-z0-9\-]+(\.[a-z]{2,5}){1,2}$', email):
            return http.HttpResponseForbidden('参数email有误')

        # 将用户传入的邮箱保存到用户数据库的email字段中
        try:
            request.user.email = email
            request.user.save()
        except Exception as e:
            logger.error(e)
            return http.JsonResponse({'code': RETCODE.DBERR, 'errmsg': '添加邮箱失败'})
        # 发送验证邮件
        verify_url = generate_verify_email_url(request.user)

        send_verify_email.delay(email, verify_url)
        # 响应结果
        return http.JsonResponse({'code': RETCODE.OK, 'errmsg': 'OK'})




class UserInfoView(LoginRequiredMixin, View):
    """用户中心"""

    def get(self,request):
        """提供用户中心页面"""
        context = {
            'username': request.user.username,
            'mobile': request.user.mobile,
            'email': request.user.email,
            'email_active': request.user.email_active
        }
        return render(request, 'user_center_info.html', context)


class LogoutView(View):
    """用户退出登录"""

    def get(self, request):
        """实现用户退出登录的逻辑"""
        # 清除状态保持信息
        logout(request)

        # 退出登录后重定向到首页
        response = redirect(reverse('contents:index'))

        # 删除cookies中的用户名
        response.delete_cookie('username')

        # 响应结果
        return response



class LoginView(View):
    """用户登录"""

    def get(self, request):
        """提供用户登录页面"""
        return render(request, 'login.html')

    def post(self, request):
        """实现用户登录逻辑"""
        # 接收参数
        username = request.POST.get('username')
        password = request.POST.get('password')
        remembered = request.POST.get('remembered')

        # 校验参数
        if not all([username, password]):
            return http.HttpResponseForbidden('缺少必传参数')
        if not re.match(r'^[a-zA-Z0-9_-]{5,20}$', username):
            return http.HttpResponseForbidden('请输入正确的用户名或手机号')

        if not re.match(r'^[0-9A-Za-z]{8,20}$', password):
            return http.HttpResponseForbidden('密码最少8位，最长20位')

        # 认证用户:使用账号查询用户是否存在，如果用户存在，再校验密码是否正确
        user = authenticate(username=username, password=password)
        if user is None:
            return render(request, 'login.html', {'account_errmsg': '账号或密码错误'})

        # 状态保持
        login(request, user)
        # 使用remembered确定状态保持周期（实现记住登录）
        if remembered != 'on':
            # 没有记住登录：状态保持在浏览器会话结束后就销毁
            request.session.set_expiry(0)  # 单位是秒
        else:
            # 记住登录：状态保持周期为两周:默认是两周
            request.session.set_expiry(None)

        # 响应结果:重定向到首页
        # 先取出next值
        next = request.GET.get('next')
        if next:
            # 如果next有值重定向到next值所对应的页面
            response = redirect(next)
        else:
            # 如果next没有值则重定向到首页
            response =  redirect(reverse('contents:index'))

        # 为了实现在首页的右上角展示用户名信息，我们需要将用户名缓存到cookie中
        # response.set_cookie('key', 'val', 'expiry')
        response.set_cookie('username', user.username, max_age=3600 * 24 * 15)
        # 用户登录成功，合并cookie购物车到redis购物车
        response = merge_carts_cookies_redis(request=request, user=user, response=response)

        # 响应结果
        return response


class UsernameCountView(View):
    '''判断用户名是否重复注册'''

    def get(self,request,username):
        '''
        :param request:  用户名对应的个数
        :return:  json
        '''
        # 实现主体实现的业务逻辑：使用username查询对应的记录的个数（filter返回满足条件的结果集）
        count = User.objects.filter(username=username).count()
        return http.JsonResponse({'code': RETCODE.OK, 'errmsg': 'OK', 'count': count})


class RegisterView(View):
    '''用户注册'''

    def get(self,request):
        '''
        提供注册页面
        :param request: 请求页面
        :return: 注册页面
        '''
        return render(request,'register.html')

    def post(self,request):
        '''实现用户注册业务逻辑'''
        # 接收参数：表单参数
        username = request.POST.get('username')
        password = request.POST.get('password')
        password2 = request.POST.get('password2')
        mobile = request.POST.get('mobile')
        allow = request.POST.get('allow')
        sms_code_client = request.POST.get('sms_code')
        # 校验参数
        # 前端校验和后端校验要分开进行验证，避免黑客恶意跨过前端，直接访问后端接口数据，后断实现校验逻辑和前端校验逻辑一样
        # 判断前端必传参数是否齐全：all([username,password....]) []里面有一个变量为空，all()返回返回的结果就为False, 全部有值返回True
        if not all([username,password,password2,mobile,allow,sms_code_client]):
            return  http.HttpResponseForbidden('缺少必传参数')
        # 判断用户名是否是5-20个字符
        if not re.match(r'^[a-zA-Z0-9_-]{5,20}$', username):
            return http.HttpResponseForbidden('请输入5-20个字符的用户名')
        # 判断密码是否是8-20个数字
        if not re.match(r'^[0-9A-Za-z]{8,20}$', password):
            return http.HttpResponseForbidden('请输入8-20位的密码')
        # 判断两次密码是否一致
        if password != password2:
            return http.HttpResponseForbidden('两次输入的密码不一致')
        # 判断手机号是否合法
        if not re.match(r'^1[3-9]\d{9}$', mobile):
            return http.HttpResponseForbidden('请输入正确的手机号码')

        # 判断验证码是否输入正确
        redis_conn = get_redis_connection('verify_code')
        sms_code_server = redis_conn.get('sms_%s' % mobile)
        if sms_code_server is None:
            return render(request, 'register.html', {'sms_code_errmsg': '无效的短信验证码'})
        if sms_code_client != sms_code_server.decode():
            return render(request, 'register.html', {'sms_code_errmsg': '输入短信验证码有误'})
        # 判断是否勾选用户协议
        if allow != 'on':
            return http.HttpResponseForbidden('请勾选用户协议')

        # 保存注册数据：实现注册业务核心
        try:
            user = User.objects.create_user(username=username,password=password,mobile=mobile)
        except DatabaseError:
            return render(request,'register.html',{'register_errmsg':'注册失败'})
        # 实现状态保持
        login(request,user)
        # 响应结果
        # return http.HttpResponse('注册成功')
        # return redirect(''/)
        # returnn redirect(reverse('contents:index')) = /
        # 响应结果:重定向到首页
        response = redirect(reverse('contents:index'))

        # 为了实现在首页的右上角展示用户名信息，我们需要将用户名缓存到cookie中
        # response.set_cookie('key', 'val', 'expiry')
        response.set_cookie('username', user.username, max_age=3600 * 24 * 15)

        # 响应结果
        return response
